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Operating system
Manages all application programs in a computer after being loaded by a boot program.
Data bus
Transfers data between a computer's memory and its CPU.
Instruction register
The part of a CPU's control unit that holds the instruction currently being executed or decoded.
Accumulator
A memory location used to store the intermediate results of arithmetic and logical operations.
Program counter
Keeps track of the memory address of the next instruction to be executed in a program.
Control unit
A subcomponent of CPU that manages computer operations.
Single allocation
The simplest memory management technique where all memory is available to a single application.
Partitioned allocation
Divides primary memory into multiple contiguous memory partitions for specific jobs.
Paged allocation
Divides memory into fixed-size units called page frames; maps pages to frames for memory allocation.
Von Neumann architecture
Consists of main memory, a CPU, and an interconnection between the memory and the CPU.
Note 
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